The Pentagon has quietly stopped calling the deployment of troops to the U.S.-Mexico border 'Operation Faithful Patriot,' dropping the name even as thousands of American forces head to southern Texas, Arizona and California.

According to U.S. officials, Defense Secretary Jim Mattis directed the department to stop using the name and simply describe the mission as military operations on the border. The change was ordered early this week, but no reason was given.

Lt. Col. Jamie Davis, a Pentagon spokesman, would only say that the department is no longer using the name. But other U.S. officials said Mattis didn't like the name and believed it was distracting from the troops' actual mission, which is in support of the border patrol. The officials spoke on condition of anonymity to describe internal deliberations.

Border ops: 19th Engineering Battalion, 41st Clearance Company, Fort Riley, KS, receive transport near the Mexican border at Donna, Texas as part of what the Pentagon is no longer calling Operation Faithful Patriot

Arrival: Troops arrive at the border crossing at Donna, TX

Brushed aside: At the Pentagon Jim Mattis, the Defense Secretary, previously bristled when asked about the deployment saying: 'We don't do stunts at this department.' Now he has banned it from being called Operation Faithful Patriot

The name hasn't been formally changed or rescinded, but the Pentagon has stopped using it in press releases and documents.

Pentagon officials rolled out the name last month after President Donald Trump ordered thousands of active duty troops to the southwest border in response to a caravan of migrant families walking slowly north through Mexico toward the U.S.

As of Wednesday, more than 5,600 troops have been deployed to Texas, Arizona and California and are mainly in staging bases. Only about 500 troops are actively supporting operations on the border, and many of those have been installing coils of razor wire and erecting tents to house U.S. troops and border patrol.

The military says it will deploy a total of about 7,000 troops, but has left open the possibility that the number could grow. Last week, Trump said he would send as many as 15,000 troops. There also have been about 2,100 National Guard troops operating along the border for months as part of a separate but related mission.

The Pentagon still has refused to release any cost estimates for the troop deployment.

The name adjustment was first reported by The Wall Street Journal.

Mattis had pushed back last week on suggestions that the move to send thousands of active-duty troops to the Southwest border is a political stunt ahead of the midterm elections.

Mattis told reporters at the Pentagon that the deployment of more than 5,200 troops is based on a request from the Department of Homeland Security and said: 'We don't do stunts in this department.'

But the active-duty troops being sent are limited in what they can do under a federal law that restricts the military from engaging in law enforcement on American soil.

That means the troops will not be allowed to detain immigrants, seize drugs from smugglers or have any direct involvement in stopping a migrant caravan that is still about 1,000 miles from the nearest border crossing.

Instead, their role will largely mirror that of the existing National Guard troops - about 2,000 in all - deployed to the border over the past six months, including providing helicopter support for border missions, installing concrete barriers and repairing and maintaining vehicles.

The new troops will include military police, combat engineers and helicopter companies equipped with advanced technology to help detect people at night.

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Allowed: National Guard personnel - including these in Ajo, Arizona - are already maintaining CBP vehicles. Active duty troops will do the same

Not allowed: This car was stopped by CBP agents near Blythe Station, California, with 40 pounds of heroin, valued at more than $688,000, and nearly 25 pounds of cocaine worth close to $280,000. The military will not be allowed to carry out such stops

Not allowed: Soldiers and Marines deployed by the president for Operation Faithful Patriot will not be allowed to stop and detain migrants crossing the border. U.S. forces are forbidden from carrying out law enforcement on U.S. soil

Allowed: U.S. Army National Guardsman Sgt. Oscar Escobar was deployed in 2011 to help carry out surveillance on the border. This new deployment will see regular troops used for the same duties

R. Gil Kerlikowske, Customs and Border Protection commissioner from 2014 to 2017, said the military cannot stop asylum seekers who show up at border crossings to seek protection, and that Border Patrol agents have had no trouble apprehending people who cross illegally.

'I see it as a political stunt and a waste of military resources and waste of tax dollars,' said Kerlikowske, who was at the helm during a major surge of Central Americans migrants in 2014.

'To use active-duty military and put them in that role, I think is a huge mistake. I see it as nothing more than pandering to the midterm elections by the president.'

Traveling mostly on foot, the caravan of migrants are still weeks, if not months, before reaching the U.S. border.

Thousands have already dropped out, applying for refugee status in Mexico or taking the Mexican government up on free bus rides back home, and the group is likely to dwindle even more during the arduous journey ahead.

And despite the heightened rhetoric, the number of immigrants apprehended at the border is dramatically lower than past years.

Border Patrol agents this year made only a quarter of the arrests they made in 2000 at the height of illegal immigration, when the agency had half of the staffing it does today.

The demographics have also drastically changed, from mostly Mexican men traveling alone, to Central American families with children.

Migrants arriving at the border will now see a sizable U.S. military presence - more than double the 2,000 who are in Syria fighting the Islamic State group - even though their mission will be largely a support role.

That's because the military is bound by the Posse Comitatus Act, a 19th- century federal law that restricts participation in law enforcement activities.

Unless Congress specifically authorizes it, military personnel can't have direct contact with civilians, including immigrants, said Scott R. Anderson of The Brookings Institution.

Air Force Gen. Terrence O'Shaughnessy, head of U.S. Northern Command, said Tuesday that at least 5,239 troops were being sent to the Southwest border as the Pentagon works to meet requests from the Department of Homeland Security.

'The 5,239 are going forward and there will be additional forces over and above the 5,239,' he said, adding that number 'is not the top line.'

Asked about the use of weapons, O'Shaughnessy said the active-duty troops have been given clear guidance on the use of force and there will be unit and individual training to make sure they know what they can and can't do. Generally, U.S. troops are authorized to use force in self-defense.

Still, the large troop deployment will be limited to performing similar support functions as the National Guard troops Trump has already sent to the border.

These include 1,500 flight hours logged by about 600 National Guard troops in Arizona since they were deployed this spring.

Members of the guard have also repaired more than 1,000 Border Patrol vehicles and completed 1,000 hours of supply and inventory, according to Customs and Border Protection.

In one case, a group of Border Patrol agents tracking drug smugglers in the remote Arizona desert in August called on a National Guard helicopter to keep an eye on the suspects and guide agents on the ground until they had them in custody.

That operation resulted in several arrests and the seizure of 465 pounds of marijuana.

It remains unclear why the administration was choosing to send active-duty troops given that they will be limited to performing the support functions the Guard already is doing.

The California National Guard has pledged up to 400 troops to the president's border mission through March 31. Jerry Brown, the only Democratic governor in the four states bordering Mexico and a frequent Trump critic, conditioned his support on the troops having nothing to do with immigration enforcement or building border barriers.

Brown said the California troops would help fight transnational criminal gangs and drug and firearms smugglers.

In New Mexico, 118 Guard troops have been helping with vehicle maintenance and repair, cargo inspection operations, surveillance and communications.

Texas Gov. Greg Abbott pledged 400 troops to the border in April. Maj. Gen. John Nichols, the head of the Texas National Guard, told Congress in July that his troops served in a 'variety of support roles,' including driving vehicles, security monitoring, and administration.